perf_counter: per event wakeups
By request, provide a way to request a wakeup every 'n' events instead
of every page of output.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Orig-LKML-Reference: <20090402091319.323309784@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h
index 06a6fba..5428ba1 100644
--- a/include/linux/perf_counter.h
+++ b/include/linux/perf_counter.h
@@ -145,7 +145,7 @@
__reserved_1 : 53;
__u32 extra_config_len;
- __u32 __reserved_4;
+ __u32 wakeup_events; /* wakeup every n events */
__u64 __reserved_2;
__u64 __reserved_3;
@@ -321,6 +321,7 @@
int nr_pages;
atomic_t wakeup;
atomic_t head;
+ atomic_t events;
struct perf_counter_mmap_page *user_page;
void *data_pages[0];
};